(V.) it is when a man dips his sack into a woman's mouth repetively. Causing the woman to choke, gag or sometimes, maybe even cause death.

If lucy was a sleep right now woooo weeee would i give her a Pounding Potato Sack .
Tom: mike was getting a shower so i grabbed his girlfriend cindy and gave her a fucking Pounding Potato Sack!
Jon: NUT UH GET THE FUCK OUTTA HERE?!
Tom: yeah no lie.
Jon: Well where is she at now?
Tom: The bottom of an ocean.